Chapter 6

Chapter 6 is titled - "A Past With Plankton, Part 1".

Summary
After Spongebob asks Mr. Krabs why Plankton wants to steal the Krabby Patty secret formula, Mr. Krabs starts telling him the story of his past with Plankton. Mr. Krabs and Plankton used to be good friends, but something drove Plankton to want to steal the Krabs' Family Krabby Patty secret formula.